The invention discloses a green
coating method based on heavy-
metal-free tanned cow crust leather. The method comprises the following procedures: to-be-coated crust leather preparation, first milling, toggling, pre-priming coat spraying, priming coat spraying, ironing, intermediate coat spraying,
isolation layer spraying, ironing, standing, second milling, oscillation
staking, top coat spraying, ironing, oscillation
staking, hand feeling layer spraying and finished leather obtaining, wherein the
coating agent components in the priming coat spraying process and the intermediate coat spraying process are the same, each
coating agent component comprises an improved
polyacrylic acid copolymer composite
emulsion, an aliphatic
polyurethane resin dispersion liquid, a water-resistant non-
expansive polyacrylic acid copolymer emulsion, a cold-resistant zigzag
polyacrylic acid resin
emulsion and a self-crosslinking polyacrylic acid
copolymer emulsion, and the coating agent in the top coat spraying process comprises a resin film-forming agent. According to the invention, the water absorption of the heavy-
metal-free tanned cow finished leather is greatly reduced, the heavy-
metal-free tanned cow finished leather has good waterproof and antifouling properties, and the coating has good dry / wet
rubbing resistance,
wear resistance, bending resistance and gluing resistance.